Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 93 for “"Permanent deformation"”.
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Permanent Deformation Behaviour of Unbound Granular Materials in Pavement Constructions
… Apparatus to establish the risk level of permanent deformations in the unbound granular layers (UGL) in pavement constructions under consideration of the seasonal effects. From this data a serviceability limit line (plastic shakedown limit) stress boundary for the unbound granular …
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Mechanistic-Empirical Modeling of Permanent Deformation in Asphalt Concrete Layers
Three mechanistic-empirical permanent deformation models were evaluated under Swedish conditions with respect to traffic, climate and materials using accelerated pavement testing and long-term pavement performance studies. The mechanistic-empirical pavement design guide (M E PDG), the …
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Optimizing truck platoon spacing to minimize asphalt concrete permanent deformation
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Permanent Deformation Behavior of Airport Flexible Pavement Base and Subbase Courses
… laboratory test results, both CCP and VCP type permanent deformation models were developed to predict maximum ruts occurred at the NAPTF under both 6-wheel and 4-wheel gear loadings applied following a wander pattern. Realistic pavement stresses induced by moving wheel loads were examined in the …
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Permanent deformation behavior of unbound granular materials and rutting model development
… research study was aimed at developing a new permanent deformation prediction model that would properly take into account the effects of applied load, applied stress in relation to material’s strength and number of load cycles through a well-established laboratory test matrix for mechanical …
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The permanent deformation of steel portal frames subjected to impulsive loading
The inelastic response of steel portal frames with a mass attached to the centre of the beam member and subjected to large dynamic loads is studied. The analysis is carried out using the mode approximation technique extended to include strain-rate sensitivity, finite deflections and pulse duration. …
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The permanent deformation of circular cylindrical shells subjected to internal explosive loading
… into methods for estimating the maximum permanent deformation of a circular cylindrical shell subjected to internal explosive loadings. A complete rigid-plastic analysis of the transient response is performed. Subsequently the effects of material properties are included. Finally the …
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An analytical method for predicting permanent deformation of foundations under cyclic loads
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1982.
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DETERMINATION OF DYNAMIC MODULI AND PERMANENT DEFORMATION OF MARYLAND ASPHALT MIXTURES USING AMPT
… the dynamic modulus (DM) and the repeated load permanent deformation (RLPD) properties. To achieve this goal, 28 asphalt mixtures were collected from construction sites/asphalt plants and tested in the Maryland State Highway Administration Office of Materials Technology Asphalt Technology …
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DEVELOPMENT OF NEW COLD BITUMEN EMULSION MIXTURES AND FINITE ELEMENT MODELLING OF PREDICTING PERMANENT DEFORMATION
… moving and static loading conditions to test for permanent deformation (rutting). The results indicate a significant improvement in the indirect tensile stiffness modulus, for all fibre-reinforced CBEMs, over different curing times. The improved tensile behaviour represents a substantial …
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Quantifying forearc deformation patterns using coastal geomorphic markers
… variations and heterogeneous patterns of permanent tectonic deformation, which are accumulated through several cycles of megathrust earthquakes. However, the correlation between earthquake deformation patterns and the sustained long-term segmentation of forearcs, particularly in Chile, …
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Improving the Laboratory Design of Asphalt Mixtures to Enhance Asphalt Pavement Durability
… pavement durability without sacrificing the permanent deformation characteristics of the mixture.</p> <p>Three asphalt mixtures were designed using the standard Superpave design method at 100 gyrations of the Superpave Gyratory Compactor, suitable for traffic levels of 3 to 30 million …
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Analysis of Unbound Aggregate Layer Deformation Behavior From Full Scale Aircraft Gear Loading With Wander
… were used to create individual pass residual deformation transverse profiles. The created transverse profiles were then combined with stress history effects to predict the residual transverse profiles for all test sections. This new permanent deformation model emphasizes the use of the …
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Comparative Evaluation of Field and Laboratory-Produced Foamed Asphalt Mixture from Reno, Nevada
… cycling. The resistance of the mixtures to permanent deformation was evaluated through the use of the repeated load triaxial (RLT) to measure the flow number (FN). The low-temperature cracking resistance of the mixtures was evaluated using the thermal stress restrained specimen test (TSRST). …
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Performance Analysis of Airport Flexible Pavements Subjected to New Generation Aircraft
… thicker granular layers. Reliable prediction of permanent deformation is a daunting task owing to complexities arising from stress history, gear offset, gear offset sequence and climatic conditions. A pragmatic way to address rutting may be to ensure that the pavement system exhibits a ""stable"" …
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Prediction of permanent deformations in asphalt concrete using the mechanistic-empirical pavement design guide
Permanent deformations, or rutting, are internationally considered to be one of the most serious distress mechanisms in asphalt pavements. Deterioration modeling is an important tool for performance prediction and diagnostics of pavements. The Mechanistic-Empirical Pavement Design Guide (M-E PDG) …
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ANALYTICAL MODELING OF RUTTING POTENTIAL OF ASPHALT MIXES USING HAMBURG WHEEL TRACKING DEVICE
Asphalt Concrete (AC) is susceptible to permanent deformation under traffic loading which is affected by AC temperature, mixture type, gradation, aggregate type, binder type and so on. There is no complete research in the literature which examined all these factors at the same time. This study …
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Heat Treatment of Orthodontic Steel Wire
… a) the ability of a vertical loop to resist permanent deformation when subjected to a tensile load; b) the effect of heat treatment on ductility of a steel orthodontic wire; c) the effect of heat treatment on the warpage of a orthodontic wire which has previously been formed. A standardized …
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Characterization of Emulsion Aggregate Mixtures
… repeated loading response (resilient modulus, permanent deformation), tensile strength, Dynamic Cone Penetrometer (DCP) and curing effects are evaluated in the laboratory. In-service EAM pavement evaluation includes distresses, DCP, and non-destructive testing using the Falling Weight …
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Integrated computational and experimental framework for the assessment of railroad ballast life-cycle behavior
… loading conditions for shear strength and permanent deformation characteristics, respectively. The experimental studies indicated that the shearing rate had no significant influence on the results of the ballast triaxial tests. Compared to clean ballast, fouled ballast samples in dry …
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